I have an EF2 Fairmont, it started life as a 6 auto, it has recently been converted to V8 and manual, using the v8 tailshaft and diff as well.

Now the v8 tailshaft was slightly bigger in circumfrence, and substantially lighter than the 6 shaft. The problem, it is hitting the floorpan, now it use to hit when it sat substanially lower than it does currently which was fair enuf, but now even though it has been returned to standard XR8 ride height the shaft is still hitting the floorpan.

My question, is the trans tunnel a different size between the manual and auto cars or is it just this larger tailshaft? If it is the tailshaft, why wasn't there any rubbing marks on the xr8 floorpan that previously housed the shaft?

Tailshafts are different but the tunnels are all the same. Did you use the XR upper control arms with the "XR body brackets" not sure what they are called? This changes the diff pinion angle. Also the "diff " upper control arm brackets have several options from memory, you need to pick the correct one (the ones furthest back).

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